EP3425778A1 - Procédé de fabrication d'une bague de déphasage fabriquée à partir d'une bande métallique - Google Patents

Procédé de fabrication d'une bague de déphasage fabriquée à partir d'une bande métallique Download PDF

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Publication number
EP3425778A1
EP3425778A1 EP17179453.0A EP17179453A EP3425778A1 EP 3425778 A1 EP3425778 A1 EP 3425778A1 EP 17179453 A EP17179453 A EP 17179453A EP 3425778 A1 EP3425778 A1 EP 3425778A1
Authority
EP
European Patent Office
Prior art keywords
short
cage rotor
circuit ring
metal strip
asynchronous machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17179453.0A
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German (de)
English (en)
Inventor
Olaf KÖRNER
Freerk Jacobus Oude Kotte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP17179453.0A priority Critical patent/EP3425778A1/fr
Publication of EP3425778A1 publication Critical patent/EP3425778A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/0012—Manufacturing cage rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • H02K17/168—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having single-cage rotors

Definitions

  • the invention relates to a method for producing a short-circuit ring of a squirrel cage rotor asynchronous machine, a method for producing a squirrel cage rotor asynchronous machine as well as a squirrel cage rotor and an asynchronous machine.
  • Short circuit rings are produced in smaller motors, in particular by a die-casting process.
  • prefabricated short-circuit rings are electrically conductively connected by means of correspondingly suitable soldering methods with conductor bars which protrude axially out of the laminated core of the squirrel-cage rotor.
  • a disadvantage of the above-described types of construction of the short-circuit ring of a squirrel cage or squirrel cage is the effort in the manufacturing process, both in a die-casting but also in the individual soldering operations of bars with corresponding sections of the shorting ring. Likewise, depending on the diameter of the squirrel cage, an increased use of material is necessary to punch out panes of copper sheets.
  • the object of the invention is to provide a comparatively simple method for producing a short-circuit ring and a squirrel-cage rotor, in which the material input of the materials used for this purpose is reduced to a minimum or the production method is optimized with regard to time and material. Furthermore, the cage rotor should have a comparatively high efficiency during operation of the asynchronous machine.
  • the solution of the task also succeeds by a squirrel cage an asynchronous machine in grooves of a magnetic conductive body located electrical conductors whose end portions protrude at the end faces of the body and are electrically connected by shorting rings, the shorting rings are formed on at least one end face of the squirrel cage by an edgewise wound electrically conductive sheet metal strip.
  • a short-circuit ring is made very material-saving by a metal strip, it is only the punching waste of the recesses, ie in particular the grooves, in which later the conductor bars are arranged. Furthermore, depending on the number of screw paths and / or height of the sheet metal strip, a sufficient line cross-section for the short-circuit ring of the squirrel cage seen in the circumferential direction is provided.
  • narrower sheet metal strips can be wound more easily. This is particularly relevant for squirrel cage rotor lower shaft height. It is advantageous if the radial height of the conductor is comparatively small in order to be able to select the radial height of the short-circuit ring, that is to say essentially the sheet-metal height.
  • the individual screw paths are electrically connected to each other. This is achieved in particular by the fact that they are welded or soldered, so that the screw paths form a compact unit, ie a short-circuit ring.
  • the welding in particular laser welding can be done radially and / or axially.
  • the magnetically conductive base body is basically constructed either of axially laminated sheets or of a sintered material.
  • the squirrel cage rotor is now produced by axially fitting on the magnetically conductive main body with its electrically conductive conductor bars projecting from the end faces in each case such a short-circuit ring formed in this way. An electrical contact is ensured by a welding or soldering of the conductor bars with the helically arranged sheets of shorting rings.
  • the short-circuit ring is therefore already prefabricated and only has to be positioned on the end faces of the magnetic base body and contacted with the conductor bars.
  • the short-circuit ring is thereby provided on the end faces of the magnetically conductive base body in sheet form, in particular helically, by means of a sheet metal strip wound around the axis. Also there there is an electrical contacting of the screw tracks of the sheet metal strip with each other and / or with the conductor bars during this winding process or thereafter.
  • Such a manufactured squirrel cage an asynchronous avoids now larger punching waste and is easy to manufacture. Due to the geometric dimensions of the sheet metal strip, e.g. the selected sheet height / sheet thickness and or the number of, for example, the screw paths can now be set, the active current-conducting part of the short-circuit ring.
  • the material of the sheet metal strip are all electrically conductive materials, in particular sheets of copper alloys or pure copper or aluminum alloy or aluminum are used. Due to the comparatively good electrical conductivity, copper-chromium-zirconium (CuCr1Zr) is preferred.
  • FIG. 1 shows an asynchronous machine 1 with a stator 2 and a squirrel cage rotor or squirrel cage 3, which has at its axial ends of its magnetic body 15, in particular its laminated core short-circuit rings 4.
  • the Squirrel cage rotor 3 is rotatably connected to a shaft 5.
  • a winding system 6, which is arranged in not-shown grooves of the stator 2, generated by electromagnetic interaction with the squirrel-cage rotor 3, a torque that can be tapped on the shaft 5.
  • the squirrel-cage rotor 3 is constructed by axially layered rotor laminations, which have essentially axially running rotor slots.
  • conductors 13 are arranged, which protrude beyond the end faces of the rotor core of the squirrel cage 3 and are electrically connected to each other by a short-circuit ring 4.
  • the short-circuit ring 4 has, in number and shape, substantially corresponding recesses 8, 12 in which the end sections 14 of the conductor bars or conductors 13 protrude.
  • the short-circuit ring 4 according to FIG. 1 and FIG. 4 protrudes radially to the air gap of the asynchronous machine 1.
  • the rotor laminations is not laminated, otherwise no graphic distinction between short-circuit ring 4 and the rotor laminations would have been possible.
  • the short-circuit ring 4 can also be displaced radially somewhat radially inwards, in particular when a steel cap or a bandage is provided on the outer circumference of the short-circuit ring 4 for centrifugal force absorption, without enlarging the diameter of the cage rotor 3.
  • FIG. 2 shows a basic winding process of a metal strip 7, in particular copper strip around a winding axis 10, which provides at a radially outer portion of this copper strip 7 grooves 8, which are executed closed.
  • the axial thickness of a short-circuit ring 4 can be specified.
  • the height of the short-circuit ring 4 is predetermined by the band height 11 substantially.
  • beads 9 are to be provided which allow a compression of the copper strip 7 in the radially inner region of the copper strip.
  • the beads 9 are recesses / elevations in this plate, which engage in the helical design of the short-circuit ring 4 in one another.
  • this configuration results in a plurality of axially projecting beads 9 which achieve a fan effect during operation of the asynchronous machine.
  • the number of nose-shaped beads 9 depends i.a. from the bending radius of the sheet metal strip 7 from.
  • these cut-outs which are adjacent to one another, can be made e.g. be closed again by welding operations at their adjacent joints, so that again there is a closed area.
  • FIG. 3 shows an identical winding process, only there, the grooves 12 are designed semi-open, which simplifies the winding process in principle, especially in the radially outer region of the copper strip.
  • the axial thickness of a short-circuit ring 4 can be specified.
  • the height of the short-circuit ring 4 is predetermined by the band height 11 substantially.
  • the axial thickness of the short-circuit ring 4 can be specified by the sheet thickness. In principle, narrower strips can be wound more easily. This is especially for squirrel cage with comparatively lower Shaft height relevant. It is advantageous if the radial height of the magnetically conductive base body 15 projecting conductor - so the end portions 14 is comparatively low to the radial height of the short-circuit ring, so essentially the sheet height to select thereafter.
  • beads 9 are to be provided which allow a compression of the copper strip 7 in the radially inner region of the copper strip.
  • the beads 9 are recesses / elevations in this plate, which engage in the helical design of the short-circuit ring 4 in one another.
  • This configuration results depending on the arrangement of the short-circuit ring 4, but preferably on the side facing away from the laminated core of the squirrel cage 3 side of the short-circuit ring 4 according to FIG. 4 a plurality of axially projecting beads 9, which achieve a fan effect during operation of the asynchronous machine.
  • the number of nose-shaped beads 9 depends, inter alia, on the bending radius of the sheet-metal strip 7.
  • the two wound short-circuit rings 4 has in common that in the radially outer grooves 8, 12, the end portions 14 of conductors 13 are used and these are contacted with the short-circuit ring 4 electrically conductive.
  • the short-circuit ring 4 can thus be fabricated in advance and then axially positioned on the end portions 14 of the conductors 13 and the conductor bars and electrically contacted.
  • the short-circuit ring 4 can also be wound helically - position by layer - on the end portions 14 of the arranged in Läufererblechken conductor 13 and the conductor bars, as is the FIG. 5 can be seen.
  • the copper strip 7 is first bent with the necessary recesses 8,12 and the beads 9 or punched to the required radius and then positioned axially position by layer on the end portions 14 of the conductor 13.
  • This axial placement 16 can take place simultaneously on both end faces or else one after the other. In this case, an electrical contacting of the conductor 13 with the respective position of the copper strip 7 and / or the previous position of the copper strip 7 takes place.
  • This solution is particularly suitable for pre-fabricated short-circuit rings 4, but can also in a manufacturing process after FIG. 4 be applied.
  • the short-circuit rings 4 Due to the construction according to the invention of the short-circuit ring 4 and the cage rotor 3, it is also possible to position the short-circuit rings 4 not only directly and the end face of the rotor core, but also spaced from this end face. Of course, if necessary, then the end portions 14 of the conductors 13 also axially further protrude from the rotor laminations to ensure sufficient electrical contact. It makes sense, at least for the first layer of the sheet metal strip 7 a kind Stop directly on the end portion 14 to provide at least one conductor 13 or a device.
  • the chamfering is realized by one or more circumferentially extending V- or U-shaped recess following the screw paths.
  • the solder flows via these recesses and / or gaps between the screw paths to the end sections 14 and surrounds the conductors 12 there.
  • the short-circuit rings 4 - if necessary - provided with radially outwardly arranged means for receiving the centrifugal forces.
  • These are, for example, steel strips or glass fiber reinforced strips.
  • Asynchronous machines with such squirrel cage or short circuit rings are used in a wide variety of applications as drive motors or generators. These are mainly vehicle drives, ie watercraft, such as ships, ferries, boats and submarines, but also drives of rail vehicles such as trams, metros, locomotives and locomotives.
  • asynchronous machines with such squirrel cage or short circuit rings are in the food and beverage industry, for example as a pump drives, as well as high-speed drives in the textile industry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Induction Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
EP17179453.0A 2017-07-04 2017-07-04 Procédé de fabrication d'une bague de déphasage fabriquée à partir d'une bande métallique Withdrawn EP3425778A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17179453.0A EP3425778A1 (fr) 2017-07-04 2017-07-04 Procédé de fabrication d'une bague de déphasage fabriquée à partir d'une bande métallique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17179453.0A EP3425778A1 (fr) 2017-07-04 2017-07-04 Procédé de fabrication d'une bague de déphasage fabriquée à partir d'une bande métallique

Publications (1)

Publication Number Publication Date
EP3425778A1 true EP3425778A1 (fr) 2019-01-09

Family

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Family Applications (1)

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EP17179453.0A Withdrawn EP3425778A1 (fr) 2017-07-04 2017-07-04 Procédé de fabrication d'une bague de déphasage fabriquée à partir d'une bande métallique

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EP (1) EP3425778A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US919862A (en) * 1908-07-15 1909-04-27 Crocker Wheele Company Squirrel-cage rotor for electric motors.
US1286138A (en) * 1914-08-07 1918-11-26 Westinghouse Electric & Mfg Co Rotor for dynamo-electric machines.
US2499390A (en) * 1944-07-10 1950-03-07 Master Electric Co Rotor for alternating current machines
DE102013005050A1 (de) 2013-03-22 2014-09-25 Wieland-Werke Ag Kurzschlussläufer und dessen Einzelteile sowie Verfahren zur Herstellung eines Kurzschlussläufers
DE102013211040A1 (de) * 2013-06-13 2014-12-18 Robert Bosch Gmbh Kurzschlussring für eine elektrische Asynchronmaschine zusammengesetzt aus Teilkreisbogen-förmigen Segmenten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US919862A (en) * 1908-07-15 1909-04-27 Crocker Wheele Company Squirrel-cage rotor for electric motors.
US1286138A (en) * 1914-08-07 1918-11-26 Westinghouse Electric & Mfg Co Rotor for dynamo-electric machines.
US2499390A (en) * 1944-07-10 1950-03-07 Master Electric Co Rotor for alternating current machines
DE102013005050A1 (de) 2013-03-22 2014-09-25 Wieland-Werke Ag Kurzschlussläufer und dessen Einzelteile sowie Verfahren zur Herstellung eines Kurzschlussläufers
DE102013211040A1 (de) * 2013-06-13 2014-12-18 Robert Bosch Gmbh Kurzschlussring für eine elektrische Asynchronmaschine zusammengesetzt aus Teilkreisbogen-förmigen Segmenten

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